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# The average (arithmetic mean) of 3a + 4 and another number

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Senior Manager
Joined: 30 Aug 2003
Posts: 322
Location: dallas , tx
The average (arithmetic mean) of 3a + 4 and another number [#permalink]

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23 Dec 2003, 20:23
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The average (arithmetic mean) of 3a + 4 and another number is 2a. What is the average of the other number and a?

2a
a - 4
a - 2
a + 2
a + 4
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shubhangi

GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4288

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23 Dec 2003, 20:43
A)

I think this problem is from Kaplan

Let X be the other number
[(3a+4)+X]/2 = 2a
(3a+4)+X = 4a
X = a-4

Therefore:
[X+a]/2 = [(a-4)+a]/2 = [2a-4]/2 = a-2
Senior Manager
Joined: 30 Aug 2003
Posts: 322
Location: dallas , tx

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23 Dec 2003, 20:48
yes its from kaplan
its a-2 right ?? then how is it choice A? it should be C.
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shubhangi

GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4288

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23 Dec 2003, 20:49
oops, I really meant C)
23 Dec 2003, 20:49
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